[clang-repl] Spell out the enum types to appease some bots.

This change is a follow-up of #148701 where clang-s390x-linux
and clang-s390x-linux-lnt failed.

Author: vgvassilev

clang/test/Interpreter/pretty-print.cpp

@@ -28,15 +28,15 @@ S4{}
 // CHECK-NEXT: (S4) @0x{{[0-9a-f]+}}
 // TODO-CHECK-NEXT: ~S4()
 
-enum Enum{ e1 = -12, e2, e3=33, e4, e5 = 33};
+enum Enum : int { e1 = -12, e2, e3=33, e4, e5 = 33};
 e2
 // CHECK-NEXT: (Enum) (e2) : int -11
 ::e1
 // CHECK-NEXT: (Enum) (e1) : int -12
 
-enum class Color { R = 0, G, B };
+enum class Color : unsigned int { R = 0, G, B };
 Color::R
-// CHECK-NEXT: (Color) (Color::R) : int 0
+// CHECK-NEXT: (Color) (Color::R) : unsigned int 0
 
 
 // Lambdas.